Yamaha CS-15D

This is a partially preset, partially variable monophonic analogue synth
which was released in 1979. It was part of a synthesizer range that
included the CS-20m, the CS-40m, and the CS-70m. It has a very solid
warm sound for a single VCO synth. The preset section is divided into
two channels. Channel 1 has 15 sounds with the usual array of
unrealistic instrument imitations and Channel 2 has 14 synth sounds plus a button to
activate the 'manual' section of the synth. There is a slider to mix
between the two channels and channel 2 can be detuned.

The 'manual' section comprises 1 VCO with a variable control between pulse
and saw waves. There are also controls for pulse width modulation, noise
and footings (32' - 2'). The 12dB filter has cut-off and resonance plus
a dedicated ADSR envelope with a control for envelope amount. It has a
nice wet and warm sound. There is a separate ADSR for the amplifier.

Most controls to the left of the preset section affect the presets as
well as the manual section. These include a modulation section with 1
LFO (sine and square), S/H (random) and repeat. Modulation can be routed
to either the VCO, VCF or VCA. There is also a global tuning pot and a
performance panel that includes portamento (which isn't very precise)
modulation and pitch wheels as well as a 'brilliance' slider. Why a
slider for VCF modulation instead of a wheel? God only knows. One
feature of the pitch wheel that has synthesists divided is that it
doesn't have a spring although a soft 'click' is felt when moved back to
the center-point. It can be handy to reach the lowest possible notes
without having to hold the wheel in place.

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